improve: add support of RFC5987 Content-Disposition formats (via #4952)

* Add support of RFC5987 for Content-Disposition

For example, `attachement; filename*=UTF-8'ru'%D1%81%D0%B2%D0%B5%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F.xlsx` in result will be  `сведения.xlsx`.

* Test of support of RFC5987 in Content-Disposition

test/core/utils.js

@@ -109,6 +109,18 @@ describe("utils", function() {
       let expectedResult = "filename.jpg"
       expect(extractFileNameFromContentDispositionHeader(cdHeader)).toEqual(expectedResult)
     })
+    
+    it("should extract quoted filename in utf-8", function(){
+      let cdHeader = "attachment; filename*=UTF-8''\"%D1%84%D0%B0%D0%B9%D0%BB.txt\""
+      let expectedResult = "файл.txt"
+      expect(extractFileNameFromContentDispositionHeader(cdHeader)).toEqual(expectedResult)
+    })
+    
+    it("should extract filename in utf-8", function(){
+      let cdHeader = "attachment; filename*=utf-8'ru'%D1%84%D0%B0%D0%B9%D0%BB.txt"
+      let expectedResult = "файл.txt"
+      expect(extractFileNameFromContentDispositionHeader(cdHeader)).toEqual(expectedResult)
+    })
 
     it("should not extract filename and return null", function(){
       let cdHeader = "attachment; no file name provided"